Lock for window sashes

ABSTRACT

A rotary bolt lock is disclosed comprising a sleeve having an interior cylindrical wall with an indentation formed therein. A bolt is slidably disposed within the sleeve. Camming means are provided for rotating the bolt as it moves longitudinally in the sleeve. A tumbler is rotatably disposed within the sleeve and coupled with the bolt. The tumbler includes a cylindrical body defining a keyway having an entrance at one end thereof and an opening along the cylindrical periphery thereof. A set of springs is mounted to the tumbler body overlaying the keyway opening. A plurality of the springs have an end projecting from the cylindrical periphery of the body for movement out of and into the sleeve indentation upon insertion and removal of a key into the keyway and into and out of the engagement with the portions of the springs overlaying the keyway opening.

United States Patent Christmas May 6,1975

[ LOCK FOR WINDOW SASHES 22 Filed: Aug. 28, 1974 211 App]. No.: 501,046

[52] US. Cl 70/364 R; 70/362; 292/D1G. 20; 70/376 [51] Int. Cl E05b 27/00 [58] Field of Search 70/362, 364 R, 364 A, 89, 70/90, 376, 377; 292/DIG. 20, DIG. 9

Primary Examiner-Robert L. Wolfe Assistant Examiner-Victor N. Sakran Attorney, Agent, or FirmNewton, Hopkins & Ormsby [57] ABSTRACT A rotary bolt lock is disclosed comprising a sleeve having an interior cylindrical wall with an indentation formed therein. A bolt is slidably disposed within the sleeve. Camming means are provided for rotating the bolt as it moves longitudinally in the sleeve. A tumbler is rotatably disposed within the sleeve and coupled with the bolt. The tumbler includes a cylindrical body defining a keyway having an entrance at one end thereof and an opening along the cylindrical periphery thereof. A set of springs is mounted to the tumbler body overlaying the keyway opening. A plurality of the springs have an end projecting from the cylindrical periphery of the body for movement out of and into the sleeve indentation upon insertion and removal of a key into the keyway and into and out of the engagement with the portions of the springs overlaying the keyway opening.

10 Claims, 6 Drawing Figures PATENTEUHAY 5197s SHEET 2 OF 2 FIG 5 FIG 6 LOCK FOR WINDOW SASHES BACKGROUND OF THE INVENTION This invention relates to rotary bolt locks such as those used in locking window sashes.

Heretofore, rotary bolt type locks have typically employed a set of axially spaced tumblers for radial movement into and out of associated detents upon insertion and extraction of a key in an axial keyway. The inclusion of a number of individual tumblers has proven costly in both manufacture of the tumblers themselves as well as in the cost of assembling the tumblers during lock manufacture. The individual tumblers have also tended to stick in one position thereby rendering the lock inoperative. The tolerances required in insuring that such sticking action does not occur and that all of the tumblers operate smoothly have proven to be quite rigid for low cost mass production. Unitary tumblers formed from a metallic blank into a torturous shape have been devised to eliminate the need for plurality of individual members. These unitary tumblers however have not met with substantial success due to their tendency to remember their former configuration as well as to deform through repeated contact with keys during operation.

Accordingly, it is a general object of the present invention to provide an improved rotary bolt lock.

More specifically, it is an object of the present invention to provide a rotary bolt lock having an improved tumbler.

Another object of the invention is to provide a rotary bolt lock having relatively few moving parts.

Yet another object of the invention is to provide a rotary bolt lock of simple and economic construction and one which may be installed with facility.

A still further object of the invention is to provide a rotary bolt lock having a tumbler which may be assembled with ease and which operates over prolonged periods of time in an effective and reliable manner.

SUMMARY OF THE INVENTION In a preferred form of the invention a rotary bolt lock is provided comprising a sleeve having an interior cylindrical wall with at least one indentation formed therein. A bolt is slidably disposed within the sleeve. Camming means are provided for rotating the bolt as it moves longitudinally in the sleeve. A tumbler is rotatably disposed within the sleeve and coupled with the bolt. The tumbler includes a cylindrical body defining a keyway having an entrance at one end thereof and an opening BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded view in perspective of a rotary bolt lock embodying principles of the invention in a preferred form.

FIG. 2 is a transverse cross-sectional view of the tumbler and sleeve components of the lock shown in FIG. 1.

FIG. 3 is another transverse cross-sectional view of the tumbler and sleeve components of the lock shown in FIG. 1 taken along a plane axially spaced from that of FIG. 2.

FIG. 4 is an exploded view in perspective of another embodiment of a rotary bolt lock embodying principles of the invention.

FIGS. 5 and 6 are two side views of the rotary bolt shown in FIG. 4 illustrating a sequence of operations in locking two window sashes together.

DETAILED DESCRIPTION OF THE DRAWINGS Referring now in more detail to the drawing, there is shown in FIGS. 1-3 a rotary bolt lock embodying principles of the present invention and comprising a cylindrical sleeve or collar 10 having a knurled end 12 for ease of gripping during installation into the bore 14 of an inside window sash l5. Sleeve 10 is provided with an annular flange 17 at the knurled end thereof to provide a positive stop for a cylindrical tumbler body 18. Sleeve 10 is also provided with two radially spaced, longitudinally extending slots 20 and 21 which provide indentations in the interior cylindrical wall 23 that defines the sleeve bore.

The cylindrical body portion 18 of the lock tumbler is seen to be formed integrally with a cylindrical bolt 25. A keyway extends axially through the tumbler body and into the bolt with a keyway entrance 27 positioned at one end of the body and a longitudinal opening 28 extending along the cylindricalsurface thereof. Bolt 25 is provided with a short indentation 29 in which a cylindrical cam follower 30 is seated with a portion thereof projecting out from the surface of the bolt. A hollow cylindrical insert 32 is press-fitted into an end portion of sleeve 10 distal the knurled end thereof. The insert has a helical slot 33 which functions as a cam race or guide in which cam follower 30 is slidably seated. After press-fitting this insert remains stationary with respect to the sleeve.

Into the cylindrical peripheral surface of tumbler body 18 is machined a helical groove which communicates each revolution with the longitudinal opening 28 of the keyway. The keyway thus serves to separate the machined helical groove into a series of six individual parallel grooves 37. Four channels 39 are bored through the tumbler body along geometric chords thereof from selected members. of the set of grooves 37 as shown in FIG. 2. Six relatively short channels 40 extend into body 18 from a side opposite that of the longitudinal opening 28 of the keyway. In this particular embodiment the four channels 39 extend from the first, second, third and fifth members of the series of grooves 37. With this arrangement thetumbler is adapted to be operated with a key 42 having ridges 44 alignable with the first, second, third and fifth groove within opening 28, respectively, once the key is completely seated within the keyway.

With particular reference now to FIG. 2 it may be seen that the tumbler further includes a set of six resilient wires dimensioned to be seated snuggly within the six grooves 37 and which function as springs. Four wires 45 are seated in the first, second, third and fifth members of the set of grooves, respectively. One end of each of these wires is seated in a short channel 40 while the other end is positioned within sleeve slot 21. Between these two ends each wire passes about a portion of the cylindrical periphery of the tumbler body within a groove 37, over keyway opening 28, and completely through a channel 39. The positioning of wire ends within sleeve slot 21 prevents rotary movement of the tumbler body since the sides of the slot provide stop means which engage the wire ends upon any attempt to rotate the tumbler body within sleeve 10. Insertion of key 42, however, brings key ridges 44 beneath these four spring wires 45 lifting the portion thereof overlaying keyway opening 28 and passing through channels 39 which action brings the end portion thereof out of sleeve slot 21. Whereas the indentations in this particular embodiment are provided by a slot passing completely through the sleeve it should be understood that such complete passage through the body of the sleeve is not necessary.

With reference next to FIG. 3, the wires 47 seated in the fourth and sixth members of grooves 37 are seen to be of shorter configuration than wires 45 seated in the other members of the set of grooves. Here, one end of each wire 47 is also seated within relatively short channels while the other end 49 projects upwardly from a ledge 50 aside keyway opening 28 radially away from the axis of the tumbler body in alignment with sleeve slot 20. The presence of these two wires 47 serves to prevent the entry of a key slug into the keyway and thereby successfully operate the lock. Should such a slug be inserted into the keyway it engages resilient wires 47 and elevates their ends 49 into sleeve slot 20.

In this position rotation of the tumbler body and bolt is inhibited by contact of wire end 49 with the sides of slot 20. In other words, though the entry of a key slug will elevate wires bringing their ends out of slot 21, such entry will simultaneously elevate wires 47 positioning their ends within sleeve slots 20. Entry of key 42 on the other hand positions key valleys 51 beneath wires 49 which does not effect a lifting action and positions key ridges 44 beneath wires 45 lifting their ends out of slot 21 thereby enabling the tumbler body to rotate and urge bolt 25 into bore 19 of outside window sash 16.

' With reference now to FIGS. 4-6, another embodiment of the invention is illustrated with a modification to the manner in which the lock bolt and tumbler body are coupled. Here, body 18 is seen to have protruding tongue at one end thereof of genrally flat construction and with a slot 52 formed centrally therein. The tumbler body tongue is slidably seated within a mating slot 55 formed in bolt 56. A pin 58 extends through a channel in the bolt formed normally slot 55 and then through the slot itself. If desired, an end portion of the pin may project out from the cylindrical surface of the bolt and thus serves as a camming member in imparting rotary movement to the bolt as it advances in sleeve 10 within race 60 of stationary insert 61 With this configuration the pin serves the double function of both limiting relative axial movement between the tumbler body and bolt as well as imparting rotary movement to the 'bolt. Alternatively, pin 30 serves as the cam follower as in the previously described embodiment.

Inasmuchas the tongue portion of tumbler body 18 is slidably seated within bolt slot 55 the rotary movement of thetumbler body is accompanied by rotary movement of the bolt. Conversely, the axial movement so imparted to the bolt by the camming action of pin in race 60 is not accompanied by any significant axial movement of the tumbler body. In this manner the end 63 of the tumbler body remains located adjacent the annular flange 17 in both locked and unlocked bolt positions where it remains readily accessible for the introduction and removal of key 42.

It should be understood that the just described embodiments merely illustrate principles of the invention in two preferred forms. Many modifications may, of course, be made to these specifically described embodiments without departure from the spirit and scope of the invention as set forth in the following claims.

What is claimed:

1. A rotary bolt lock comprising a sleeve having an interior cylindrical wall with at least one indentation formed therein; a bolt slidably disposed within said sleeve; camming means for rotating said bolt as it moves longitudinally in said sleeve; and a tumbler coupled with said bolt, said tumbler including a cylindrical body disposed within said sleeve and defining a keyway having an entrance at one end thereof and an opening along the cylindrical periphery thereof, and a set of springs mounted to said body overlaying said keyway opening with a plurality of said springs having an end projecting from the cylindrical periphery of said tumbler body for movement out of and into said sleeve indentation upon insertion and removal of a key into said keyway and into and out of engagement with the portions of said springs overlaying said keyway opening.

2. A rotary bolt lock in accordance with claim 1 wherein said tumbler body is rigidly joined to said bolt.

3. A rotary bolt lock in accordance with claim 1 wherein said bolt has a longitudinal slot opening to the bolt end adjacent said tumbler body, and wherein said tumbler body has a projection extending into said bolt slot whereby the bolt and tumbler body may move a substantial distance relative to one another longitudinally within the sleeve but an insubstantial distance relative to one another rotatably within the sleeve.

4. A rotary bolt lock in accordance with claim 3 comprising stop means for limiting longitudinal movement of said bolt and tumbler body relative to one another.

5. A rotary bolt lock in accordance with claim 4 comprising a pin transversing said bolt slot and projecting from a peripheral surface of said bolt and with the slot transversing portion of said pin forming a component of said stop means and with the projecting portion of said pin forming a component of said camming means.

6. A rotary bolt lock in accordance with claim 1 wherein said tumbler body has a set of grooves formed in the cylindrical peripheral surface thereof in which said set of springs is seated.

7. A rotary bolt lock in accordance with claim 1 wherein each of said springs consists of a resilient wire.

8. A rotary bolt lock in accordance with claim 1 wherein said tumbler body has a set of parallel channels passing therethrough along geometric chords, and wherein said plurality of springs pass through said channels.

9. A rotary bolt lock in accordance with claim 1 wherein said sleeve has a second indentation formed therein, and wherein said set of springs includes at least one spring overlaying said keyway opening and having an end projecting radially from the axis of said tumbler body for movement into and out of said sleeve second indentation upon insertion and removal of a slug into said keyway and into and out of engagement with the portion of said one spring overlaying said keyway opening.

10. A rotary bolt lock comprising a sleeve having an interior cylindrical wall with two radially spaced slots formed therein; a bolt slidably disposed within said sleeve; camming means for rotating said bolt as it moves longitudinally in said sleeve; and a tumbler rotatably disposed within said sleeve and coupled with said bolt, said tumbler including a. a cylindrical body defining:

i. a keyway having an entrance at one end of said body and a longitudinal opening along the cylindrical surface of said body,

ii. a set of grooves in the cylindrical surface of said body communication with said keyway longitudiother of said sleeve slots. 

1. A rotary bolt lock comprising a sleeve having an interior cylindrical wall with at least one indentation formed therein; a bolt slidably disposed within said sleeve; camming means for rotating said bolt as it moves longitudinally in said sleeve; and a tumbler coupled with said bolt, said tumbler including a cylindrical body disposed within said sleeve and defining a keyway having an entrance at one end thereof and an opening along the cylindrical periphery thereof, and a set of springs mounted to said body overlaying said keyway opening with a plurality of said springs having an end projecting from the cylindrical periphery of said tumbler body for movement out of and into said sleeve indentation upon insertion and removal of a key into said keyway and into and out of engagement with the portions of said springs overlaying said keyway opening.
 2. A rotary bolt lock in accordance with claim 1 wherein said tumbler body is rigidly joined to said bolt.
 3. A rotary bolt lock in accordance with claim 1 wherein said bolt has a longitudinal slot opening to the bolt end adjacent said tumbler body, and wherein said tumbler body has a projection extending into said bolt slot whereby the bolt and tumbler body may move a substantial distance relative to one another longitudinally within the sleeve but an insubstantial distance relative to one another rotatably within the sleeve.
 4. A rotary bolt lock in accordance with claim 3 comprising stop means for limiting longitudinal movement of said bolt and tumbler body relative to one another.
 5. A rotary bolt lock in accordance with claim 4 comprising a pin transversing said bolt slot and projecting from a peripheral surface of said bolt and with the slot transversing portion of said pin forming a component of said stop means and with the projecting portion of said pin forming a component of said camming means.
 6. A rotary bolt lock in accordance with claim 1 wherein said tumbler body has a set of grooves formed in the cylindrical peripheral surface thereof in which said set of springs is seated.
 7. A rotary bolt lock in accordance with claim 1 wherein each of said springs consists of a resilient wire.
 8. A rotary bolt lock in accordance with claim 1 wherein said tumbler body has a set of parallel channels passing therethrough along geometric chords, and wherein said plurality of springs pass through said channels.
 9. A rotary bolt lock in accordance with claim 1 wherein said sleeve has a second indentation formed therein, and wherein said set of springs includes at least one spring overlaying said keyway opening and having an end projecting radially from the axis of said tumbler body for movement into and out of said sleeve second indentation upon insertion and removal of a slug into said keyway and into and out of engagement with the portion of said one spring overlaying said keyway opening.
 10. A rotary bolt lock comprising a sleeve having an interior cylindrical wall with two radially spaced slots formed therein; a bolt slidably disposed within said sleeve; camming means for rotating said bolt as it moves longitudinally in said sleeve; and a tumbler rotatably disposed within said sleeve and coupled with said bolt, said tumbler including a. a cylindrical body defining: i. a keyway having an entrance at one end of said body and a longitudinal opening along the cylindrical surface of said body, ii. a set of grooves in the cylindrical surface of said body communication with said keyway longitudinal opening, and iii. at least one channel passing through said cylindrical body from one of said grooves; b. a first resilient wire seated in said one groove and passing over said keyway longitudinal opening and through said channel into one of said sleeve slots; and c. a second resilient wire seated in another of said grooves and passing over said keyway longitudinAl opening with an end thereof projecting towards the other of said sleeve slots. 